Professor Leo A. Groarke is professor of philosophy and provost at the University of Windsor. His research interests include the history of ideas, social and political philosophy, informal logic, and argumentation theory. He has published numerous books, chapters, and journal articles in these and other areas. Professor Christopher W. Tindale is professor of philosophy at the University of Windsor. His research interests include argumentation theory, ethics, and ancient philosophy. He has published numerous book chapters and extensively in journals and is the author of Fallacies and Argument Appraisal (2007) and Rhetorical Argumentation (2004). He is co-editor of the journal Informal Logic.